Serum metabolites as diagnostic biomarkers for preterm labor: a metabolomics-based study. - Yi, Qiuhong; Lai, Hua; Li, Qin; Wang, Chen; Zhou, Xiao; Liao, Lijun; Xin, Siming; Zhang, Feng; Zeng, Xiaoming; Yang, Bicheng; Zheng, Jiusheng (BMC Pregnancy & Childbirth, 2025)